21221013312234 has 72 divisors (see below), whose sum is σ = 48739942611360. Its totient is φ = 6671850695856.

The previous prime is 21221013312227. The next prime is 21221013312269. The reversal of 21221013312234 is 43221331012212.

21221013312234 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 101 + 331 + 223 + 4 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21221013312198 and 21221013312207.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5718294 + ... + 8668385.

It is an arithmetic number, because the mean of its divisors is an integer number (676943647380).

Almost surely, 2^{21221013312234} is an apocalyptic number.

21221013312234 is an abundant number, since it is smaller than the sum of its proper divisors (27518929299126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221013312234 is a wasteful number, since it uses less digits than its factorization.

21221013312234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14386952 (or 14386930 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21221013312234 its reverse (43221331012212), we get a palindrome (64442344324446).

The spelling of 21221013312234 in words is "twenty-one trillion, two hundred twenty-one billion, thirteen million, three hundred twelve thousand, two hundred thirty-four".